public class StringBuilder_02 {
    public static void main(String[] args) {
        int []arr={1,2,3};
        String s = arrayToString(arr);
        System.out.println(s);
    }


    public static  String arrayToString(int[] arr){
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        for (int i=0;i<arr.length;i++)
        {
            if (i==arr.length-1){
                sb.append(arr[i]);

            }else
            {
                sb.append(arr[i]);
                sb.append(",");
            }
        }
        sb.append("]");
        return sb.toString();
    }
}
